Succession can be primary or secondary based on what kind of radical environmental change happens in an ecosystem. Which of the following changes is not an example of secondary succession? A. Chicago had a snowfall in late April of 2019, so spring was delayed this year.

B. Flooding of the Mississippi river in 2019 was one of the worst floods in modern history.

C. Tornados caused property damage in southeastern US states in March and April of 2019.

D. A wildfire at I-95 North near Jacksonville in May 2019 burned 600 acres in the Yellow Bluff area.